The entities involved in this procedure is depicted in
Figure 17.
Note that since the short message mobile originated procedure covers the functionality required at SM-RL for transferring TPDUs from SC to MS, the procedure described covers both short message (SMS-SUBMIT) and command (SMS-COMMAND) transfer. The term
"short message transfer" therefore in this clause, covers both cases.
In Figure 18, sequence diagrams for the following basic situations of short message mobile terminated transfer attempt:
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Successful short message transfer;
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Short message transfer attempt failing due to error at the MSC or SGSN;
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Short message transfer attempt failing due to negative outcome of VLR information retrieval;
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Short message transfer attempt failing due to error at the SMS-IWMSC;
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Short message transfer attempt failing due to error at the SC;
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Short Message transfer attempt successful due to the existence of an SMS Interworking agreement;
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Short Message transfer attempt failing due to non-existence of an SMS Interworking agreement;
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Short Message transfer attempt failing due to negative outcome of HLR information retrieval.
References to the relevant specifications of the different operations are given in
clause 4.